My bachelor cousin died 2yrs ago, I had heard via another cousin he was thinking about leaving money to his cousins DC, rather than cousins (or friends/charity which he could well have done). Apart from my DB who has never worked, all cousins were relatively comfortable and early 50s upwards, so it made sense.
He did indeed leave to cousins DC, and given he was wealthier than anyone knew, they all got a sizeable amount. The beneficiaries ranged in age from my DD14.5, to mid-forties. It has been life changing for those I know, enabling some to get on property ladder for first time in 30s, or again after divorce, or substantially pay off mortgages.
The only downside was that no min age was specified (not sure why his solicitor didn't advise one) which meant my DS got his at 18, as will DD next year, and my niece inherited at 20. Fortunately my DC are fairly sensible, and have no problem in us helping them invest it for their house deposits when older. But I quite understand that for some 18yo, that might not be the case!
However, my niece, whilst sensible, has grabby parents who I think would take it all if they could!! I hope she still has a sufficient amount left to help her get on the property ladder in a few years. Indeed DB is the only cousin who complained it should have gone to our generation, so he could have had some! Even the cousin without children had no complaints, as they saw how it benefitted their nieces.
So, done properly, with minimum ages to inherit, I think it is a brilliant idea. Should we eventually have DGC, and our own DC be reasonably settled financially, I think we would consider jumping a generation.